.loading-box {
    width: 100%;
    height: 100vh;
    background-color: rgb(0, 0, 0, .4);
    position: absolute;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    display: none;
    opacity: 0;
    top: 0;
    left: 0;
    transition: all .3s;
}

.loading-main-scroll-bar {
    border: 5px solid #ffffff;
    /* 蓝色边框 */
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    /* 透明顶部边框，创建三角形 */
    border-radius: 50%;
    /* 圆形 */
    width: 50px;
    height: 50px;
    animation: loadingAnimate 2s linear infinite;
    /* 使用 spin 动画，1秒一次，线性无限循环 */
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.loading-main-scroll-bar::before{
    content: '';
    position: absolute;
    width: 30px;
    height: 30px;
    border: 5px solid #ffffff;
    border-radius: 50%;
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
    animation: loadingAnimate 2s linear infinite;
}

.loading-main-box-text {
    margin-top: 20px;
    font-size: 1.2em;
    color: #ffffff;
}

@keyframes loadingAnimate {

    /* // 12 360 100  30 */
    0% {
        transform: rotateZ(0deg);
    }

    100% {
        transform: rotateZ(360deg);
    }
}